x+2+x+4+x+6+x+8=25760 b] (6975-x+785) ÷4=859

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1. $x + 2 + x + 4 + x + 6 + x + 8 =25760$

   $x + 20 + x + x + x                   =25760$

   $4x +20    = 25760$

   $4x  = 25760 – 20$

   $4x = 25740$

   $x = 25740 :4$

   $x =6435$

   $(6975-x+785) :4=859$

   $6975 – x + 785 = 859 x 4$

   $6975 – x + 785 = 3436$

   $6975 – x = 3436 – 785$

   $6975 –  = 2651$

   $x = 6975 – 2651$

   $x = 4324$

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2. `x+2+x+4+x+6+x+8=25760`

   `=> (x+x+x+x) + (2+4+6+8) = 25760`

   `=> 4x + 20 = 25760`

   `=> 4x = 25760 – 20`

   `=> 4x = 25740`

   `=> x = 25740 : 4` 

   `=> x = 6435`

   `(6975-x+785) :4=859`

   `=> 6975-x+785 = 859 × 4 `

   `=> 6975-x+785 = 3436`

   `=> 6975-x = 3436 – 785`

   `=> 6975-x = 2651`

   `=> x = 6975 – 2651`

   `=> x = 4324`

   (Chúc bạn học tốt)

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